1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1997-2005
5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef lint
36 #if 0
37 static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95";
38 #endif
39 #endif /* not lint */
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <sys/types.h>
44 #include <sys/time.h>
45 #include <sys/stat.h>
46 #include <dirent.h>
47 #include <errno.h>
48 #include <inttypes.h>
49 #include <limits.h>
50 #include <pwd.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55 #include <wchar.h>
56 #include <wctype.h>
57
58 /*
59 * Routines to expand arguments to commands. We have to deal with
60 * backquotes, shell variables, and file metacharacters.
61 */
62
63 #include "shell.h"
64 #include "main.h"
65 #include "nodes.h"
66 #include "eval.h"
67 #include "expand.h"
68 #include "syntax.h"
69 #include "parser.h"
70 #include "jobs.h"
71 #include "options.h"
72 #include "var.h"
73 #include "input.h"
74 #include "output.h"
75 #include "memalloc.h"
76 #include "error.h"
77 #include "mystring.h"
78 #include "arith.h"
79 #include "show.h"
80 #include "builtins.h"
81
82 /*
83 * Structure specifying which parts of the string should be searched
84 * for IFS characters.
85 */
86
87 struct ifsregion {
88 struct ifsregion *next; /* next region in list */
89 int begoff; /* offset of start of region */
90 int endoff; /* offset of end of region */
91 int inquotes; /* search for nul bytes only */
92 };
93
94
95 static char *expdest; /* output of current string */
96 static struct nodelist *argbackq; /* list of back quote expressions */
97 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
98 static struct ifsregion *ifslastp; /* last struct in list */
99 static struct arglist exparg; /* holds expanded arg list */
100
101 static char *argstr(char *, int);
102 static char *exptilde(char *, int);
103 static char *expari(char *);
104 static void expbackq(union node *, int, int);
105 static int subevalvar(char *, char *, int, int, int, int, int);
106 static char *evalvar(char *, int);
107 static int varisset(const char *, int);
108 static void varvalue(const char *, int, int, int);
109 static void recordregion(int, int, int);
110 static void removerecordregions(int);
111 static void ifsbreakup(char *, struct arglist *);
112 static void expandmeta(struct strlist *, int);
113 static void expmeta(char *, char *);
114 static void addfname(char *);
115 static struct strlist *expsort(struct strlist *);
116 static struct strlist *msort(struct strlist *, int);
117 static int patmatch(const char *, const char *, int);
118 static char *cvtnum(int, char *);
119 static int collate_range_cmp(wchar_t, wchar_t);
120
121 static int
collate_range_cmp(wchar_t c1,wchar_t c2)122 collate_range_cmp(wchar_t c1, wchar_t c2)
123 {
124 static wchar_t s1[2], s2[2];
125
126 s1[0] = c1;
127 s2[0] = c2;
128 return (wcscoll(s1, s2));
129 }
130
131 static char *
stputs_quotes(const char * data,const char * syntax,char * p)132 stputs_quotes(const char *data, const char *syntax, char *p)
133 {
134 while (*data) {
135 CHECKSTRSPACE(2, p);
136 if (syntax[(int)*data] == CCTL)
137 USTPUTC(CTLESC, p);
138 USTPUTC(*data++, p);
139 }
140 return (p);
141 }
142 #define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
143
144 /*
145 * Perform expansions on an argument, placing the resulting list of arguments
146 * in arglist. Parameter expansion, command substitution and arithmetic
147 * expansion are always performed; additional expansions can be requested
148 * via flag (EXP_*).
149 * The result is left in the stack string.
150 * When arglist is NULL, perform here document expansion.
151 *
152 * Caution: this function uses global state and is not reentrant.
153 * However, a new invocation after an interrupted invocation is safe
154 * and will reset the global state for the new call.
155 */
156 void
expandarg(union node * arg,struct arglist * arglist,int flag)157 expandarg(union node *arg, struct arglist *arglist, int flag)
158 {
159 struct strlist *sp;
160 char *p;
161
162 argbackq = arg->narg.backquote;
163 STARTSTACKSTR(expdest);
164 ifsfirst.next = NULL;
165 ifslastp = NULL;
166 argstr(arg->narg.text, flag);
167 if (arglist == NULL) {
168 STACKSTRNUL(expdest);
169 return; /* here document expanded */
170 }
171 STPUTC('\0', expdest);
172 p = grabstackstr(expdest);
173 exparg.lastp = &exparg.list;
174 if (flag & EXP_FULL) {
175 ifsbreakup(p, &exparg);
176 *exparg.lastp = NULL;
177 exparg.lastp = &exparg.list;
178 expandmeta(exparg.list, flag);
179 } else {
180 sp = (struct strlist *)stalloc(sizeof (struct strlist));
181 sp->text = p;
182 *exparg.lastp = sp;
183 exparg.lastp = &sp->next;
184 }
185 while (ifsfirst.next != NULL) {
186 struct ifsregion *ifsp;
187 INTOFF;
188 ifsp = ifsfirst.next->next;
189 ckfree(ifsfirst.next);
190 ifsfirst.next = ifsp;
191 INTON;
192 }
193 *exparg.lastp = NULL;
194 if (exparg.list) {
195 *arglist->lastp = exparg.list;
196 arglist->lastp = exparg.lastp;
197 }
198 }
199
200
201
202 /*
203 * Perform parameter expansion, command substitution and arithmetic
204 * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
205 * Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'.
206 * This is used to expand word in ${var+word} etc.
207 * If EXP_FULL or EXP_CASE are set, keep and/or generate CTLESC
208 * characters to allow for further processing.
209 * If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
210 */
211 static char *
argstr(char * p,int flag)212 argstr(char *p, int flag)
213 {
214 char c;
215 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
216 int firsteq = 1;
217 int split_lit;
218 int lit_quoted;
219
220 split_lit = flag & EXP_SPLIT_LIT;
221 lit_quoted = flag & EXP_LIT_QUOTED;
222 flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
223 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
224 p = exptilde(p, flag);
225 for (;;) {
226 CHECKSTRSPACE(2, expdest);
227 switch (c = *p++) {
228 case '\0':
229 return (p - 1);
230 case CTLENDVAR:
231 case CTLENDARI:
232 return (p);
233 case CTLQUOTEMARK:
234 lit_quoted = 1;
235 /* "$@" syntax adherence hack */
236 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
237 break;
238 if ((flag & EXP_FULL) != 0)
239 USTPUTC(c, expdest);
240 break;
241 case CTLQUOTEEND:
242 lit_quoted = 0;
243 break;
244 case CTLESC:
245 if (quotes)
246 USTPUTC(c, expdest);
247 c = *p++;
248 USTPUTC(c, expdest);
249 if (split_lit && !lit_quoted)
250 recordregion(expdest - stackblock() -
251 (quotes ? 2 : 1),
252 expdest - stackblock(), 0);
253 break;
254 case CTLVAR:
255 p = evalvar(p, flag);
256 break;
257 case CTLBACKQ:
258 case CTLBACKQ|CTLQUOTE:
259 expbackq(argbackq->n, c & CTLQUOTE, flag);
260 argbackq = argbackq->next;
261 break;
262 case CTLARI:
263 p = expari(p);
264 break;
265 case ':':
266 case '=':
267 /*
268 * sort of a hack - expand tildes in variable
269 * assignments (after the first '=' and after ':'s).
270 */
271 USTPUTC(c, expdest);
272 if (split_lit && !lit_quoted)
273 recordregion(expdest - stackblock() - 1,
274 expdest - stackblock(), 0);
275 if (flag & EXP_VARTILDE && *p == '~' &&
276 (c != '=' || firsteq)) {
277 if (c == '=')
278 firsteq = 0;
279 p = exptilde(p, flag);
280 }
281 break;
282 default:
283 USTPUTC(c, expdest);
284 if (split_lit && !lit_quoted)
285 recordregion(expdest - stackblock() - 1,
286 expdest - stackblock(), 0);
287 }
288 }
289 }
290
291 /*
292 * Perform tilde expansion, placing the result in the stack string and
293 * returning the next position in the input string to process.
294 */
295 static char *
exptilde(char * p,int flag)296 exptilde(char *p, int flag)
297 {
298 char c, *startp = p;
299 struct passwd *pw;
300 char *home;
301 int quotes = flag & (EXP_FULL | EXP_CASE);
302
303 while ((c = *p) != '\0') {
304 switch(c) {
305 case CTLESC: /* This means CTL* are always considered quoted. */
306 case CTLVAR:
307 case CTLBACKQ:
308 case CTLBACKQ | CTLQUOTE:
309 case CTLARI:
310 case CTLENDARI:
311 case CTLQUOTEMARK:
312 return (startp);
313 case ':':
314 if (flag & EXP_VARTILDE)
315 goto done;
316 break;
317 case '/':
318 case CTLENDVAR:
319 goto done;
320 }
321 p++;
322 }
323 done:
324 *p = '\0';
325 if (*(startp+1) == '\0') {
326 if ((home = lookupvar("HOME")) == NULL)
327 goto lose;
328 } else {
329 if ((pw = getpwnam(startp+1)) == NULL)
330 goto lose;
331 home = pw->pw_dir;
332 }
333 if (*home == '\0')
334 goto lose;
335 *p = c;
336 if (quotes)
337 STPUTS_QUOTES(home, DQSYNTAX, expdest);
338 else
339 STPUTS(home, expdest);
340 return (p);
341 lose:
342 *p = c;
343 return (startp);
344 }
345
346
347 static void
removerecordregions(int endoff)348 removerecordregions(int endoff)
349 {
350 if (ifslastp == NULL)
351 return;
352
353 if (ifsfirst.endoff > endoff) {
354 while (ifsfirst.next != NULL) {
355 struct ifsregion *ifsp;
356 INTOFF;
357 ifsp = ifsfirst.next->next;
358 ckfree(ifsfirst.next);
359 ifsfirst.next = ifsp;
360 INTON;
361 }
362 if (ifsfirst.begoff > endoff)
363 ifslastp = NULL;
364 else {
365 ifslastp = &ifsfirst;
366 ifsfirst.endoff = endoff;
367 }
368 return;
369 }
370
371 ifslastp = &ifsfirst;
372 while (ifslastp->next && ifslastp->next->begoff < endoff)
373 ifslastp=ifslastp->next;
374 while (ifslastp->next != NULL) {
375 struct ifsregion *ifsp;
376 INTOFF;
377 ifsp = ifslastp->next->next;
378 ckfree(ifslastp->next);
379 ifslastp->next = ifsp;
380 INTON;
381 }
382 if (ifslastp->endoff > endoff)
383 ifslastp->endoff = endoff;
384 }
385
386 /*
387 * Expand arithmetic expression.
388 * Note that flag is not required as digits never require CTLESC characters.
389 */
390 static char *
expari(char * p)391 expari(char *p)
392 {
393 char *q, *start;
394 arith_t result;
395 int begoff;
396 int quoted;
397 int adj;
398
399 quoted = *p++ == '"';
400 begoff = expdest - stackblock();
401 p = argstr(p, 0);
402 removerecordregions(begoff);
403 STPUTC('\0', expdest);
404 start = stackblock() + begoff;
405
406 q = grabstackstr(expdest);
407 result = arith(start);
408 ungrabstackstr(q, expdest);
409
410 start = stackblock() + begoff;
411 adj = start - expdest;
412 STADJUST(adj, expdest);
413
414 CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest);
415 fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result);
416 adj = strlen(expdest);
417 STADJUST(adj, expdest);
418 if (!quoted)
419 recordregion(begoff, expdest - stackblock(), 0);
420 return p;
421 }
422
423
424 /*
425 * Perform command substitution.
426 */
427 static void
expbackq(union node * cmd,int quoted,int flag)428 expbackq(union node *cmd, int quoted, int flag)
429 {
430 struct backcmd in;
431 int i;
432 char buf[128];
433 char *p;
434 char *dest = expdest;
435 struct ifsregion saveifs, *savelastp;
436 struct nodelist *saveargbackq;
437 char lastc;
438 int startloc = dest - stackblock();
439 char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
440 int quotes = flag & (EXP_FULL | EXP_CASE);
441 size_t nnl;
442
443 INTOFF;
444 saveifs = ifsfirst;
445 savelastp = ifslastp;
446 saveargbackq = argbackq;
447 p = grabstackstr(dest);
448 evalbackcmd(cmd, &in);
449 ungrabstackstr(p, dest);
450 ifsfirst = saveifs;
451 ifslastp = savelastp;
452 argbackq = saveargbackq;
453
454 p = in.buf;
455 lastc = '\0';
456 nnl = 0;
457 /* Don't copy trailing newlines */
458 for (;;) {
459 if (--in.nleft < 0) {
460 if (in.fd < 0)
461 break;
462 while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
463 TRACE(("expbackq: read returns %d\n", i));
464 if (i <= 0)
465 break;
466 p = buf;
467 in.nleft = i - 1;
468 }
469 lastc = *p++;
470 if (lastc != '\0') {
471 if (lastc == '\n') {
472 nnl++;
473 } else {
474 CHECKSTRSPACE(nnl + 2, dest);
475 while (nnl > 0) {
476 nnl--;
477 USTPUTC('\n', dest);
478 }
479 if (quotes && syntax[(int)lastc] == CCTL)
480 USTPUTC(CTLESC, dest);
481 USTPUTC(lastc, dest);
482 }
483 }
484 }
485
486 if (in.fd >= 0)
487 close(in.fd);
488 if (in.buf)
489 ckfree(in.buf);
490 if (in.jp)
491 exitstatus = waitforjob(in.jp, (int *)NULL);
492 if (quoted == 0)
493 recordregion(startloc, dest - stackblock(), 0);
494 TRACE(("expbackq: size=%td: \"%.*s\"\n",
495 ((dest - stackblock()) - startloc),
496 (int)((dest - stackblock()) - startloc),
497 stackblock() + startloc));
498 expdest = dest;
499 INTON;
500 }
501
502
503
504 static int
subevalvar(char * p,char * str,int strloc,int subtype,int startloc,int varflags,int quotes)505 subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
506 int varflags, int quotes)
507 {
508 char *startp;
509 char *loc = NULL;
510 char *q;
511 int c = 0;
512 struct nodelist *saveargbackq = argbackq;
513 int amount;
514
515 argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
516 subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
517 EXP_CASE : 0) | EXP_TILDE);
518 STACKSTRNUL(expdest);
519 argbackq = saveargbackq;
520 startp = stackblock() + startloc;
521 if (str == NULL)
522 str = stackblock() + strloc;
523
524 switch (subtype) {
525 case VSASSIGN:
526 setvar(str, startp, 0);
527 amount = startp - expdest;
528 STADJUST(amount, expdest);
529 varflags &= ~VSNUL;
530 return 1;
531
532 case VSQUESTION:
533 if (*p != CTLENDVAR) {
534 outfmt(out2, "%s\n", startp);
535 error((char *)NULL);
536 }
537 error("%.*s: parameter %snot set", (int)(p - str - 1),
538 str, (varflags & VSNUL) ? "null or "
539 : nullstr);
540 return 0;
541
542 case VSTRIMLEFT:
543 for (loc = startp; loc < str; loc++) {
544 c = *loc;
545 *loc = '\0';
546 if (patmatch(str, startp, quotes)) {
547 *loc = c;
548 goto recordleft;
549 }
550 *loc = c;
551 if (quotes && *loc == CTLESC)
552 loc++;
553 }
554 return 0;
555
556 case VSTRIMLEFTMAX:
557 for (loc = str - 1; loc >= startp;) {
558 c = *loc;
559 *loc = '\0';
560 if (patmatch(str, startp, quotes)) {
561 *loc = c;
562 goto recordleft;
563 }
564 *loc = c;
565 loc--;
566 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
567 for (q = startp; q < loc; q++)
568 if (*q == CTLESC)
569 q++;
570 if (q > loc)
571 loc--;
572 }
573 }
574 return 0;
575
576 case VSTRIMRIGHT:
577 for (loc = str - 1; loc >= startp;) {
578 if (patmatch(str, loc, quotes)) {
579 amount = loc - expdest;
580 STADJUST(amount, expdest);
581 return 1;
582 }
583 loc--;
584 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
585 for (q = startp; q < loc; q++)
586 if (*q == CTLESC)
587 q++;
588 if (q > loc)
589 loc--;
590 }
591 }
592 return 0;
593
594 case VSTRIMRIGHTMAX:
595 for (loc = startp; loc < str - 1; loc++) {
596 if (patmatch(str, loc, quotes)) {
597 amount = loc - expdest;
598 STADJUST(amount, expdest);
599 return 1;
600 }
601 if (quotes && *loc == CTLESC)
602 loc++;
603 }
604 return 0;
605
606
607 default:
608 abort();
609 }
610
611 recordleft:
612 amount = ((str - 1) - (loc - startp)) - expdest;
613 STADJUST(amount, expdest);
614 while (loc != str - 1)
615 *startp++ = *loc++;
616 return 1;
617 }
618
619
620 /*
621 * Expand a variable, and return a pointer to the next character in the
622 * input string.
623 */
624
625 static char *
evalvar(char * p,int flag)626 evalvar(char *p, int flag)
627 {
628 int subtype;
629 int varflags;
630 char *var;
631 const char *val;
632 int patloc;
633 int c;
634 int set;
635 int special;
636 int startloc;
637 int varlen;
638 int varlenb;
639 int easy;
640 int quotes = flag & (EXP_FULL | EXP_CASE);
641
642 varflags = (unsigned char)*p++;
643 subtype = varflags & VSTYPE;
644 var = p;
645 special = 0;
646 if (! is_name(*p))
647 special = 1;
648 p = strchr(p, '=') + 1;
649 again: /* jump here after setting a variable with ${var=text} */
650 if (varflags & VSLINENO) {
651 set = 1;
652 special = 1;
653 val = NULL;
654 } else if (special) {
655 set = varisset(var, varflags & VSNUL);
656 val = NULL;
657 } else {
658 val = bltinlookup(var, 1);
659 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
660 val = NULL;
661 set = 0;
662 } else
663 set = 1;
664 }
665 varlen = 0;
666 startloc = expdest - stackblock();
667 if (!set && uflag && *var != '@' && *var != '*') {
668 switch (subtype) {
669 case VSNORMAL:
670 case VSTRIMLEFT:
671 case VSTRIMLEFTMAX:
672 case VSTRIMRIGHT:
673 case VSTRIMRIGHTMAX:
674 case VSLENGTH:
675 error("%.*s: parameter not set", (int)(p - var - 1),
676 var);
677 }
678 }
679 if (set && subtype != VSPLUS) {
680 /* insert the value of the variable */
681 if (special) {
682 if (varflags & VSLINENO)
683 STPUTBIN(var, p - var - 1, expdest);
684 else
685 varvalue(var, varflags & VSQUOTE, subtype, flag);
686 if (subtype == VSLENGTH) {
687 varlenb = expdest - stackblock() - startloc;
688 varlen = varlenb;
689 if (localeisutf8) {
690 val = stackblock() + startloc;
691 for (;val != expdest; val++)
692 if ((*val & 0xC0) == 0x80)
693 varlen--;
694 }
695 STADJUST(-varlenb, expdest);
696 }
697 } else {
698 char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
699 : BASESYNTAX;
700
701 if (subtype == VSLENGTH) {
702 for (;*val; val++)
703 if (!localeisutf8 ||
704 (*val & 0xC0) != 0x80)
705 varlen++;
706 }
707 else {
708 if (quotes)
709 STPUTS_QUOTES(val, syntax, expdest);
710 else
711 STPUTS(val, expdest);
712
713 }
714 }
715 }
716
717 if (subtype == VSPLUS)
718 set = ! set;
719
720 easy = ((varflags & VSQUOTE) == 0 ||
721 (*var == '@' && shellparam.nparam != 1));
722
723
724 switch (subtype) {
725 case VSLENGTH:
726 expdest = cvtnum(varlen, expdest);
727 goto record;
728
729 case VSNORMAL:
730 if (!easy)
731 break;
732 record:
733 recordregion(startloc, expdest - stackblock(),
734 varflags & VSQUOTE || (ifsset() && ifsval()[0] == '\0' &&
735 (*var == '@' || *var == '*')));
736 break;
737
738 case VSPLUS:
739 case VSMINUS:
740 if (!set) {
741 argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
742 (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
743 break;
744 }
745 if (easy)
746 goto record;
747 break;
748
749 case VSTRIMLEFT:
750 case VSTRIMLEFTMAX:
751 case VSTRIMRIGHT:
752 case VSTRIMRIGHTMAX:
753 if (!set)
754 break;
755 /*
756 * Terminate the string and start recording the pattern
757 * right after it
758 */
759 STPUTC('\0', expdest);
760 patloc = expdest - stackblock();
761 if (subevalvar(p, NULL, patloc, subtype,
762 startloc, varflags, quotes) == 0) {
763 int amount = (expdest - stackblock() - patloc) + 1;
764 STADJUST(-amount, expdest);
765 }
766 /* Remove any recorded regions beyond start of variable */
767 removerecordregions(startloc);
768 goto record;
769
770 case VSASSIGN:
771 case VSQUESTION:
772 if (!set) {
773 if (subevalvar(p, var, 0, subtype, startloc, varflags,
774 quotes)) {
775 varflags &= ~VSNUL;
776 /*
777 * Remove any recorded regions beyond
778 * start of variable
779 */
780 removerecordregions(startloc);
781 goto again;
782 }
783 break;
784 }
785 if (easy)
786 goto record;
787 break;
788
789 case VSERROR:
790 c = p - var - 1;
791 error("${%.*s%s}: Bad substitution", c, var,
792 (c > 0 && *p != CTLENDVAR) ? "..." : "");
793
794 default:
795 abort();
796 }
797
798 if (subtype != VSNORMAL) { /* skip to end of alternative */
799 int nesting = 1;
800 for (;;) {
801 if ((c = *p++) == CTLESC)
802 p++;
803 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
804 if (set)
805 argbackq = argbackq->next;
806 } else if (c == CTLVAR) {
807 if ((*p++ & VSTYPE) != VSNORMAL)
808 nesting++;
809 } else if (c == CTLENDVAR) {
810 if (--nesting == 0)
811 break;
812 }
813 }
814 }
815 return p;
816 }
817
818
819
820 /*
821 * Test whether a specialized variable is set.
822 */
823
824 static int
varisset(const char * name,int nulok)825 varisset(const char *name, int nulok)
826 {
827
828 if (*name == '!')
829 return backgndpidset();
830 else if (*name == '@' || *name == '*') {
831 if (*shellparam.p == NULL)
832 return 0;
833
834 if (nulok) {
835 char **av;
836
837 for (av = shellparam.p; *av; av++)
838 if (**av != '\0')
839 return 1;
840 return 0;
841 }
842 } else if (is_digit(*name)) {
843 char *ap;
844 long num;
845
846 errno = 0;
847 num = strtol(name, NULL, 10);
848 if (errno != 0 || num > shellparam.nparam)
849 return 0;
850
851 if (num == 0)
852 ap = arg0;
853 else
854 ap = shellparam.p[num - 1];
855
856 if (nulok && (ap == NULL || *ap == '\0'))
857 return 0;
858 }
859 return 1;
860 }
861
862 static void
strtodest(const char * p,int flag,int subtype,int quoted)863 strtodest(const char *p, int flag, int subtype, int quoted)
864 {
865 if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
866 STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
867 else
868 STPUTS(p, expdest);
869 }
870
871 /*
872 * Add the value of a specialized variable to the stack string.
873 */
874
875 static void
varvalue(const char * name,int quoted,int subtype,int flag)876 varvalue(const char *name, int quoted, int subtype, int flag)
877 {
878 int num;
879 char *p;
880 int i;
881 char sep;
882 char **ap;
883
884 switch (*name) {
885 case '$':
886 num = rootpid;
887 goto numvar;
888 case '?':
889 num = oexitstatus;
890 goto numvar;
891 case '#':
892 num = shellparam.nparam;
893 goto numvar;
894 case '!':
895 num = backgndpidval();
896 numvar:
897 expdest = cvtnum(num, expdest);
898 break;
899 case '-':
900 for (i = 0 ; i < NOPTS ; i++) {
901 if (optlist[i].val)
902 STPUTC(optlist[i].letter, expdest);
903 }
904 break;
905 case '@':
906 if (flag & EXP_FULL && quoted) {
907 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
908 strtodest(p, flag, subtype, quoted);
909 if (*ap)
910 STPUTC('\0', expdest);
911 }
912 break;
913 }
914 /* FALLTHROUGH */
915 case '*':
916 if (ifsset())
917 sep = ifsval()[0];
918 else
919 sep = ' ';
920 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
921 strtodest(p, flag, subtype, quoted);
922 if (!*ap)
923 break;
924 if (sep || (flag & EXP_FULL && !quoted && **ap != '\0'))
925 STPUTC(sep, expdest);
926 }
927 break;
928 case '0':
929 p = arg0;
930 strtodest(p, flag, subtype, quoted);
931 break;
932 default:
933 if (is_digit(*name)) {
934 num = atoi(name);
935 if (num > 0 && num <= shellparam.nparam) {
936 p = shellparam.p[num - 1];
937 strtodest(p, flag, subtype, quoted);
938 }
939 }
940 break;
941 }
942 }
943
944
945
946 /*
947 * Record the fact that we have to scan this region of the
948 * string for IFS characters.
949 */
950
951 static void
recordregion(int start,int end,int inquotes)952 recordregion(int start, int end, int inquotes)
953 {
954 struct ifsregion *ifsp;
955
956 INTOFF;
957 if (ifslastp == NULL) {
958 ifsp = &ifsfirst;
959 } else {
960 if (ifslastp->endoff == start
961 && ifslastp->inquotes == inquotes) {
962 /* extend previous area */
963 ifslastp->endoff = end;
964 INTON;
965 return;
966 }
967 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
968 ifslastp->next = ifsp;
969 }
970 ifslastp = ifsp;
971 ifslastp->next = NULL;
972 ifslastp->begoff = start;
973 ifslastp->endoff = end;
974 ifslastp->inquotes = inquotes;
975 INTON;
976 }
977
978
979
980 /*
981 * Break the argument string into pieces based upon IFS and add the
982 * strings to the argument list. The regions of the string to be
983 * searched for IFS characters have been stored by recordregion.
984 * CTLESC characters are preserved but have little effect in this pass
985 * other than escaping CTL* characters. In particular, they do not escape
986 * IFS characters: that should be done with the ifsregion mechanism.
987 * CTLQUOTEMARK characters are used to preserve empty quoted strings.
988 * This pass treats them as a regular character, making the string non-empty.
989 * Later, they are removed along with the other CTL* characters.
990 */
991 static void
ifsbreakup(char * string,struct arglist * arglist)992 ifsbreakup(char *string, struct arglist *arglist)
993 {
994 struct ifsregion *ifsp;
995 struct strlist *sp;
996 char *start;
997 char *p;
998 char *q;
999 const char *ifs;
1000 const char *ifsspc;
1001 int had_param_ch = 0;
1002
1003 start = string;
1004
1005 if (ifslastp == NULL) {
1006 /* Return entire argument, IFS doesn't apply to any of it */
1007 sp = (struct strlist *)stalloc(sizeof *sp);
1008 sp->text = start;
1009 *arglist->lastp = sp;
1010 arglist->lastp = &sp->next;
1011 return;
1012 }
1013
1014 ifs = ifsset() ? ifsval() : " \t\n";
1015
1016 for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
1017 p = string + ifsp->begoff;
1018 while (p < string + ifsp->endoff) {
1019 q = p;
1020 if (*p == CTLESC)
1021 p++;
1022 if (ifsp->inquotes) {
1023 /* Only NULs (should be from "$@") end args */
1024 had_param_ch = 1;
1025 if (*p != 0) {
1026 p++;
1027 continue;
1028 }
1029 ifsspc = NULL;
1030 } else {
1031 if (!strchr(ifs, *p)) {
1032 had_param_ch = 1;
1033 p++;
1034 continue;
1035 }
1036 ifsspc = strchr(" \t\n", *p);
1037
1038 /* Ignore IFS whitespace at start */
1039 if (q == start && ifsspc != NULL) {
1040 p++;
1041 start = p;
1042 continue;
1043 }
1044 had_param_ch = 0;
1045 }
1046
1047 /* Save this argument... */
1048 *q = '\0';
1049 sp = (struct strlist *)stalloc(sizeof *sp);
1050 sp->text = start;
1051 *arglist->lastp = sp;
1052 arglist->lastp = &sp->next;
1053 p++;
1054
1055 if (ifsspc != NULL) {
1056 /* Ignore further trailing IFS whitespace */
1057 for (; p < string + ifsp->endoff; p++) {
1058 q = p;
1059 if (*p == CTLESC)
1060 p++;
1061 if (strchr(ifs, *p) == NULL) {
1062 p = q;
1063 break;
1064 }
1065 if (strchr(" \t\n", *p) == NULL) {
1066 p++;
1067 break;
1068 }
1069 }
1070 }
1071 start = p;
1072 }
1073 }
1074
1075 /*
1076 * Save anything left as an argument.
1077 * Traditionally we have treated 'IFS=':'; set -- x$IFS' as
1078 * generating 2 arguments, the second of which is empty.
1079 * Some recent clarification of the Posix spec say that it
1080 * should only generate one....
1081 */
1082 if (had_param_ch || *start != 0) {
1083 sp = (struct strlist *)stalloc(sizeof *sp);
1084 sp->text = start;
1085 *arglist->lastp = sp;
1086 arglist->lastp = &sp->next;
1087 }
1088 }
1089
1090
1091 static char expdir[PATH_MAX];
1092 #define expdir_end (expdir + sizeof(expdir))
1093
1094 /*
1095 * Perform pathname generation and remove control characters.
1096 * At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
1097 * The results are stored in the list exparg.
1098 */
1099 static void
expandmeta(struct strlist * str,int flag __unused)1100 expandmeta(struct strlist *str, int flag __unused)
1101 {
1102 char *p;
1103 struct strlist **savelastp;
1104 struct strlist *sp;
1105 char c;
1106
1107 while (str) {
1108 if (fflag)
1109 goto nometa;
1110 p = str->text;
1111 for (;;) { /* fast check for meta chars */
1112 if ((c = *p++) == '\0')
1113 goto nometa;
1114 if (c == '*' || c == '?' || c == '[')
1115 break;
1116 }
1117 savelastp = exparg.lastp;
1118 INTOFF;
1119 expmeta(expdir, str->text);
1120 INTON;
1121 if (exparg.lastp == savelastp) {
1122 /*
1123 * no matches
1124 */
1125 nometa:
1126 *exparg.lastp = str;
1127 rmescapes(str->text);
1128 exparg.lastp = &str->next;
1129 } else {
1130 *exparg.lastp = NULL;
1131 *savelastp = sp = expsort(*savelastp);
1132 while (sp->next != NULL)
1133 sp = sp->next;
1134 exparg.lastp = &sp->next;
1135 }
1136 str = str->next;
1137 }
1138 }
1139
1140
1141 /*
1142 * Do metacharacter (i.e. *, ?, [...]) expansion.
1143 */
1144
1145 static void
expmeta(char * enddir,char * name)1146 expmeta(char *enddir, char *name)
1147 {
1148 const char *p;
1149 const char *q;
1150 const char *start;
1151 char *endname;
1152 int metaflag;
1153 struct stat statb;
1154 DIR *dirp;
1155 struct dirent *dp;
1156 int atend;
1157 int matchdot;
1158 int esc;
1159 int namlen;
1160
1161 metaflag = 0;
1162 start = name;
1163 for (p = name; esc = 0, *p; p += esc + 1) {
1164 if (*p == '*' || *p == '?')
1165 metaflag = 1;
1166 else if (*p == '[') {
1167 q = p + 1;
1168 if (*q == '!' || *q == '^')
1169 q++;
1170 for (;;) {
1171 while (*q == CTLQUOTEMARK)
1172 q++;
1173 if (*q == CTLESC)
1174 q++;
1175 if (*q == '/' || *q == '\0')
1176 break;
1177 if (*++q == ']') {
1178 metaflag = 1;
1179 break;
1180 }
1181 }
1182 } else if (*p == '\0')
1183 break;
1184 else if (*p == CTLQUOTEMARK)
1185 continue;
1186 else {
1187 if (*p == CTLESC)
1188 esc++;
1189 if (p[esc] == '/') {
1190 if (metaflag)
1191 break;
1192 start = p + esc + 1;
1193 }
1194 }
1195 }
1196 if (metaflag == 0) { /* we've reached the end of the file name */
1197 if (enddir != expdir)
1198 metaflag++;
1199 for (p = name ; ; p++) {
1200 if (*p == CTLQUOTEMARK)
1201 continue;
1202 if (*p == CTLESC)
1203 p++;
1204 *enddir++ = *p;
1205 if (*p == '\0')
1206 break;
1207 if (enddir == expdir_end)
1208 return;
1209 }
1210 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
1211 addfname(expdir);
1212 return;
1213 }
1214 endname = name + (p - name);
1215 if (start != name) {
1216 p = name;
1217 while (p < start) {
1218 while (*p == CTLQUOTEMARK)
1219 p++;
1220 if (*p == CTLESC)
1221 p++;
1222 *enddir++ = *p++;
1223 if (enddir == expdir_end)
1224 return;
1225 }
1226 }
1227 if (enddir == expdir) {
1228 p = ".";
1229 } else if (enddir == expdir + 1 && *expdir == '/') {
1230 p = "/";
1231 } else {
1232 p = expdir;
1233 enddir[-1] = '\0';
1234 }
1235 if ((dirp = opendir(p)) == NULL)
1236 return;
1237 if (enddir != expdir)
1238 enddir[-1] = '/';
1239 if (*endname == 0) {
1240 atend = 1;
1241 } else {
1242 atend = 0;
1243 *endname = '\0';
1244 endname += esc + 1;
1245 }
1246 matchdot = 0;
1247 p = start;
1248 while (*p == CTLQUOTEMARK)
1249 p++;
1250 if (*p == CTLESC)
1251 p++;
1252 if (*p == '.')
1253 matchdot++;
1254 while (! int_pending() && (dp = readdir(dirp)) != NULL) {
1255 if (dp->d_name[0] == '.' && ! matchdot)
1256 continue;
1257 if (patmatch(start, dp->d_name, 0)) {
1258 namlen = dp->d_namlen;
1259 if (enddir + namlen + 1 > expdir_end)
1260 continue;
1261 memcpy(enddir, dp->d_name, namlen + 1);
1262 if (atend)
1263 addfname(expdir);
1264 else {
1265 if (dp->d_type != DT_UNKNOWN &&
1266 dp->d_type != DT_DIR &&
1267 dp->d_type != DT_LNK)
1268 continue;
1269 if (enddir + namlen + 2 > expdir_end)
1270 continue;
1271 enddir[namlen] = '/';
1272 enddir[namlen + 1] = '\0';
1273 expmeta(enddir + namlen + 1, endname);
1274 }
1275 }
1276 }
1277 closedir(dirp);
1278 if (! atend)
1279 endname[-esc - 1] = esc ? CTLESC : '/';
1280 }
1281
1282
1283 /*
1284 * Add a file name to the list.
1285 */
1286
1287 static void
addfname(char * name)1288 addfname(char *name)
1289 {
1290 char *p;
1291 struct strlist *sp;
1292 size_t len;
1293
1294 len = strlen(name);
1295 p = stalloc(len + 1);
1296 memcpy(p, name, len + 1);
1297 sp = (struct strlist *)stalloc(sizeof *sp);
1298 sp->text = p;
1299 *exparg.lastp = sp;
1300 exparg.lastp = &sp->next;
1301 }
1302
1303
1304 /*
1305 * Sort the results of file name expansion. It calculates the number of
1306 * strings to sort and then calls msort (short for merge sort) to do the
1307 * work.
1308 */
1309
1310 static struct strlist *
expsort(struct strlist * str)1311 expsort(struct strlist *str)
1312 {
1313 int len;
1314 struct strlist *sp;
1315
1316 len = 0;
1317 for (sp = str ; sp ; sp = sp->next)
1318 len++;
1319 return msort(str, len);
1320 }
1321
1322
1323 static struct strlist *
msort(struct strlist * list,int len)1324 msort(struct strlist *list, int len)
1325 {
1326 struct strlist *p, *q = NULL;
1327 struct strlist **lpp;
1328 int half;
1329 int n;
1330
1331 if (len <= 1)
1332 return list;
1333 half = len >> 1;
1334 p = list;
1335 for (n = half ; --n >= 0 ; ) {
1336 q = p;
1337 p = p->next;
1338 }
1339 q->next = NULL; /* terminate first half of list */
1340 q = msort(list, half); /* sort first half of list */
1341 p = msort(p, len - half); /* sort second half */
1342 lpp = &list;
1343 for (;;) {
1344 if (strcmp(p->text, q->text) < 0) {
1345 *lpp = p;
1346 lpp = &p->next;
1347 if ((p = *lpp) == NULL) {
1348 *lpp = q;
1349 break;
1350 }
1351 } else {
1352 *lpp = q;
1353 lpp = &q->next;
1354 if ((q = *lpp) == NULL) {
1355 *lpp = p;
1356 break;
1357 }
1358 }
1359 }
1360 return list;
1361 }
1362
1363
1364
1365 static wchar_t
get_wc(const char ** p)1366 get_wc(const char **p)
1367 {
1368 wchar_t c;
1369 int chrlen;
1370
1371 chrlen = mbtowc(&c, *p, 4);
1372 if (chrlen == 0)
1373 return 0;
1374 else if (chrlen == -1)
1375 c = 0;
1376 else
1377 *p += chrlen;
1378 return c;
1379 }
1380
1381
1382 /*
1383 * See if a character matches a character class, starting at the first colon
1384 * of "[:class:]".
1385 * If a valid character class is recognized, a pointer to the next character
1386 * after the final closing bracket is stored into *end, otherwise a null
1387 * pointer is stored into *end.
1388 */
1389 static int
match_charclass(const char * p,wchar_t chr,const char ** end)1390 match_charclass(const char *p, wchar_t chr, const char **end)
1391 {
1392 char name[20];
1393 const char *nameend;
1394 wctype_t cclass;
1395
1396 *end = NULL;
1397 p++;
1398 nameend = strstr(p, ":]");
1399 if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) ||
1400 nameend == p)
1401 return 0;
1402 memcpy(name, p, nameend - p);
1403 name[nameend - p] = '\0';
1404 *end = nameend + 2;
1405 cclass = wctype(name);
1406 /* An unknown class matches nothing but is valid nevertheless. */
1407 if (cclass == 0)
1408 return 0;
1409 return iswctype(chr, cclass);
1410 }
1411
1412
1413 /*
1414 * Returns true if the pattern matches the string.
1415 */
1416
1417 static int
patmatch(const char * pattern,const char * string,int squoted)1418 patmatch(const char *pattern, const char *string, int squoted)
1419 {
1420 const char *p, *q, *end;
1421 const char *bt_p, *bt_q;
1422 char c;
1423 wchar_t wc, wc2;
1424
1425 p = pattern;
1426 q = string;
1427 bt_p = NULL;
1428 bt_q = NULL;
1429 for (;;) {
1430 switch (c = *p++) {
1431 case '\0':
1432 if (*q != '\0')
1433 goto backtrack;
1434 return 1;
1435 case CTLESC:
1436 if (squoted && *q == CTLESC)
1437 q++;
1438 if (*q++ != *p++)
1439 goto backtrack;
1440 break;
1441 case CTLQUOTEMARK:
1442 continue;
1443 case '?':
1444 if (squoted && *q == CTLESC)
1445 q++;
1446 if (*q == '\0')
1447 return 0;
1448 if (localeisutf8) {
1449 wc = get_wc(&q);
1450 /*
1451 * A '?' does not match invalid UTF-8 but a
1452 * '*' does, so backtrack.
1453 */
1454 if (wc == 0)
1455 goto backtrack;
1456 } else
1457 wc = (unsigned char)*q++;
1458 break;
1459 case '*':
1460 c = *p;
1461 while (c == CTLQUOTEMARK || c == '*')
1462 c = *++p;
1463 /*
1464 * If the pattern ends here, we know the string
1465 * matches without needing to look at the rest of it.
1466 */
1467 if (c == '\0')
1468 return 1;
1469 /*
1470 * First try the shortest match for the '*' that
1471 * could work. We can forget any earlier '*' since
1472 * there is no way having it match more characters
1473 * can help us, given that we are already here.
1474 */
1475 bt_p = p;
1476 bt_q = q;
1477 break;
1478 case '[': {
1479 const char *endp;
1480 int invert, found;
1481 wchar_t chr;
1482
1483 endp = p;
1484 if (*endp == '!' || *endp == '^')
1485 endp++;
1486 for (;;) {
1487 while (*endp == CTLQUOTEMARK)
1488 endp++;
1489 if (*endp == 0)
1490 goto dft; /* no matching ] */
1491 if (*endp == CTLESC)
1492 endp++;
1493 if (*++endp == ']')
1494 break;
1495 }
1496 invert = 0;
1497 if (*p == '!' || *p == '^') {
1498 invert++;
1499 p++;
1500 }
1501 found = 0;
1502 if (squoted && *q == CTLESC)
1503 q++;
1504 if (*q == '\0')
1505 return 0;
1506 if (localeisutf8) {
1507 chr = get_wc(&q);
1508 if (chr == 0)
1509 goto backtrack;
1510 } else
1511 chr = (unsigned char)*q++;
1512 c = *p++;
1513 do {
1514 if (c == CTLQUOTEMARK)
1515 continue;
1516 if (c == '[' && *p == ':') {
1517 found |= match_charclass(p, chr, &end);
1518 if (end != NULL)
1519 p = end;
1520 }
1521 if (c == CTLESC)
1522 c = *p++;
1523 if (localeisutf8 && c & 0x80) {
1524 p--;
1525 wc = get_wc(&p);
1526 if (wc == 0) /* bad utf-8 */
1527 return 0;
1528 } else
1529 wc = (unsigned char)c;
1530 if (*p == '-' && p[1] != ']') {
1531 p++;
1532 while (*p == CTLQUOTEMARK)
1533 p++;
1534 if (*p == CTLESC)
1535 p++;
1536 if (localeisutf8) {
1537 wc2 = get_wc(&p);
1538 if (wc2 == 0) /* bad utf-8 */
1539 return 0;
1540 } else
1541 wc2 = (unsigned char)*p++;
1542 if ( collate_range_cmp(chr, wc) >= 0
1543 && collate_range_cmp(chr, wc2) <= 0
1544 )
1545 found = 1;
1546 } else {
1547 if (chr == wc)
1548 found = 1;
1549 }
1550 } while ((c = *p++) != ']');
1551 if (found == invert)
1552 goto backtrack;
1553 break;
1554 }
1555 dft: default:
1556 if (squoted && *q == CTLESC)
1557 q++;
1558 if (*q == '\0')
1559 return 0;
1560 if (*q++ == c)
1561 break;
1562 backtrack:
1563 /*
1564 * If we have a mismatch (other than hitting the end
1565 * of the string), go back to the last '*' seen and
1566 * have it match one additional character.
1567 */
1568 if (bt_p == NULL)
1569 return 0;
1570 if (squoted && *bt_q == CTLESC)
1571 bt_q++;
1572 if (*bt_q == '\0')
1573 return 0;
1574 bt_q++;
1575 p = bt_p;
1576 q = bt_q;
1577 break;
1578 }
1579 }
1580 }
1581
1582
1583
1584 /*
1585 * Remove any CTLESC and CTLQUOTEMARK characters from a string.
1586 */
1587
1588 void
rmescapes(char * str)1589 rmescapes(char *str)
1590 {
1591 char *p, *q;
1592
1593 p = str;
1594 while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
1595 if (*p++ == '\0')
1596 return;
1597 }
1598 q = p;
1599 while (*p) {
1600 if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
1601 p++;
1602 continue;
1603 }
1604 if (*p == CTLESC)
1605 p++;
1606 *q++ = *p++;
1607 }
1608 *q = '\0';
1609 }
1610
1611
1612
1613 /*
1614 * See if a pattern matches in a case statement.
1615 */
1616
1617 int
casematch(union node * pattern,const char * val)1618 casematch(union node *pattern, const char *val)
1619 {
1620 struct stackmark smark;
1621 int result;
1622 char *p;
1623
1624 setstackmark(&smark);
1625 argbackq = pattern->narg.backquote;
1626 STARTSTACKSTR(expdest);
1627 ifslastp = NULL;
1628 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
1629 STPUTC('\0', expdest);
1630 p = grabstackstr(expdest);
1631 result = patmatch(p, val, 0);
1632 popstackmark(&smark);
1633 return result;
1634 }
1635
1636 /*
1637 * Our own itoa().
1638 */
1639
1640 static char *
cvtnum(int num,char * buf)1641 cvtnum(int num, char *buf)
1642 {
1643 char temp[32];
1644 int neg = num < 0;
1645 char *p = temp + 31;
1646
1647 temp[31] = '\0';
1648
1649 do {
1650 *--p = num % 10 + '0';
1651 } while ((num /= 10) != 0);
1652
1653 if (neg)
1654 *--p = '-';
1655
1656 STPUTS(p, buf);
1657 return buf;
1658 }
1659
1660 /*
1661 * Do most of the work for wordexp(3).
1662 */
1663
1664 int
wordexpcmd(int argc,char ** argv)1665 wordexpcmd(int argc, char **argv)
1666 {
1667 size_t len;
1668 int i;
1669
1670 out1fmt("%08x", argc - 1);
1671 for (i = 1, len = 0; i < argc; i++)
1672 len += strlen(argv[i]);
1673 out1fmt("%08x", (int)len);
1674 for (i = 1; i < argc; i++)
1675 outbin(argv[i], strlen(argv[i]) + 1, out1);
1676 return (0);
1677 }
1678